Current Events Bell Ringer for Grades 9–12: What a new study of octopus DNA can and can’t prove
A free current events bell ringer for grades 9–12. Put the prompt on the board as students walk in, give them three to five minutes, then go over it together. The answer and teacher notes are in the box below the prompt.
The prompt
A University of Vienna team reported this week in Nature Communications that, hundreds of millions of years ago, the DNA of octopuses, squid, and cuttlefish was reorganized so that once-separate regions of their chromosomes came into close contact. Many of the new, changeable DNA loops sit near genes tied to the nervous system. The researchers propose this may help explain how these animals became so intelligent, but say the study does not prove it. (a) Why can't they yet claim the DNA change caused the intelligence? (b) Describe one kind of evidence that would make the claim stronger.
Answer and teacher notes
(a) The study shows a pattern: DNA structure changes that sit near nervous-system genes. A pattern or correlation is not the same as cause. Other changes could explain the intelligence, and scientists can't rerun evolution to test it.
(b) Answers will vary. Strong ideas: show that disrupting specific loops changes how those nervous-system genes switch on; compare more species, including cephalopod relatives with simpler nervous systems; or link the loops to differences in brain development. Push students to name what result would weaken the idea, too. The authors call the process "regulatory entanglement."
Source: ScienceDaily: Scientists Find a Surprising Genetic Twist Behind Octopus Intelligence (University of Vienna; Nature Communications, 2026)
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